Online Help:

Usage: /vol/vssp/local/trees/amma-4/linux/bin/scd [options] 
   -optload () [] Load options from a file.  
   -optsave () [] Save options to a file.  
   -d (/dev/cua1) [/dev/cua1] Serial port to use. 
   -n (hydra.ee.surrey.ac.uk:4044) [hydra.ee.surrey.ac.uk:4044] Net connection to listen to. 
   -c (switch.conf) [switch.conf] Switch configuration file 
   -l (TRUE) [TRUE] Connect to real router. 
   -r (FALSE) [FALSE] Run in raw mode.
   -v (TRUE) [TRUE] Verbose mode.
   -help (TRUE) [FALSE] Print usage information.